1) Nitrogenous compounds of the glucose-grown and the ethanol-grown yeast cells were investigated.
2) Amounts of amino acids in amino acid pool and in RNA bound amino acids fraction were higher in the ethanol-grown cells. Hydroxy-amino acids and cystine were higher in the ethanol-grown cells than in the glucose-grown cells.
3) Difference in amino acids composition was observed in peptide fraction. Cystine was higher and basic amino acids were lower in the ethanol-grown cells than in the glucose-grown cells.
4) No difference in amino acids composition of protein fraction was observed between the ethanol-grown and the glucose-grown cells.
5) It is concluded that nitrogenous compounds are influenced strongly by the compoistion of culture medium.